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Would I be able to fix this problem myself if I could purchase a new Blender Gear because my A/C only blows hot air and will not change to Cold air. I read that there is a product called The "HeaterTreater", does anyone know if that works? And I have also been told I can go through my glove box and locate the Blender Gear box and change it to hot or cold that way, is that true?